5e:Swarm of Bones
|Swarm of Bones |
|Large swarm of tiny undead, chaotic evil|
|Armor Class: 10|
|Hit Points: 39 (8d10)|
|Speed: 30 ft., climb 30 ft.|
|Damage Resistances: bludgeoning, piercing, and slashing|
|Condition Immune: charmed, exhaustion, frightened, grappled, paralyzed, poisoned, prone, restrained, stunned, suffocating|
|Senses: blindsight 30 ft., passive perception 10|
|Challenge: 2 (450 xp)|
|Proficiency Bonus (PB): +2|
False Appearance. If the swarm does not move, it appears to be an inanimate pile of bones.
Multiattack. The swarm makes one attack against each creature in its space plus one attack against a creature outside its space but within reach.
Sometimes skeletons, once destroyed, retain some of the magic that animated them. The magic twists and the remaining bones and bone fragments will conglomerate into a pile that will will seek out other skeletal remains inanimate or undead, humanoid, beast, monstrosity, or whatever it can find, and absorb them into the swarm.
The swarm hates all of the living. It will kill and strip the flesh from any creature it encounters, adding the bones to the swarm.
The swarm is especially vengeful against the person that created the original undead skeletons that spawned it, and will know its creator if it comes within range of its blindsight. It will seek out its creator, although it has no special ability to find its creator. But if it finds the creator, it will attack it in preference to all other creatures. 
Sources and Notes
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Monster data +
Swarm of Bones (Size: Large, Type: Swarm, Subtypes: Undead, Alignment: Chaotic Evil, HP: 39, CR: 2, Features: False Appearance • Magical Attacks • Spider Climb • Swarm • Multiattack • Cuts • Stabs • and Slams, Has Lair: No, NPC: No, Canon: No, Pointer: No, Hidden: No, UA: No, User: Yes, Sources: Rlyehable)